Repeat the steps untill you've killed all 5 of the Unbeateable Dragons and you'll advance to the next stage.

It is recommended to bring fire protection to this battle as their combined combo with the Dragon Warden might result in a tremendous waste. Also it is recomended for a single knight to block them all while a second knight take'em one by one once the flowers are ready.

Keep in mind that the fire from the dragons will damage the Spirit of Fertility so be careful when luring them.